2006 Lexus GS430 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2005 PROD. OWNER'S MANUAL (OM30649U)

AIR CONDITIONING
260SETTING OPERATION—manual control
When one of the manual control switches is depressed
while operating in automatic mode, the mode relevant to
the depressed switch is set. Other conditions continue to
be adjusted automatically.
If manual air flow selection is desired—
G21006
The outlets from which air is delivered can be selected
manually by touching the switch. The function of each mode
is as follows:
1
Panel— Air flows mainly from the instrument panel vents
and rear vents.
2 Bilevel— Air flows from the floor vents, the instrument
panel vents and rear vents.
When you set the temperature selector setting at about
the middle in automatic operation, warm air flows out of
the floor vents and relatively low−temperature air flows
out of the instrument panel vents and rear vents.
3 Floor— Air flows mainly from the floor vents and rear
vents.
4 Floor/Windshield— Air flows mainly from the floor vents,
windshield vents and rear vents.
Take in the fresh air by selecting the OUTSIDE AIR mode with
the air intake control button.
If manual fan speed control is desired—
G21007
 1 Fan speed at low 2Fan speed at high
The fan speed can be set to your desired speed by touching
the appropriate air flow control switch. The higher the fan
speed is, the more air is delivered. Pushi ng the ”OFF” button
turns off the fan.
To remove exterior windshield frost and interior windshield fog,
use the high speed setting.

AIR CONDITIONING
261
If manual switching of air intake is desired—
G21008
Each time you push the air intake control button, the mode
changes in order from the RECIRCULATED AIR mode to
AUTOMATIC mode to OUTSIDE AIR mode, then back to the
RECIRCULATED
AIR mode. Each indicator light shows which
mode is now selected.
1 RECIRCULATED AIR mode— If quick circulation of
cooled air is desired, select this mode.
2 EXHAUST GAS AUTOMATIC mode—If the outside air
contains harmful substances like exhaust gas (i.e., when
the vehicle running just in front of your vehicle accelerates
rapidly), the system changes automatically from the
OUTSIDE AIR mode (with indicators
2
and 3 on) to
the RECIRCULATED AIR mode (with indicators 1
and 2 on).
3 OUTSIDE AIR mode—The system will take fresh outside
air into the vehicle. Turning off the air conditioning manually will cancel the
EXHAUST
GAS AUTOMATIC mode. If you select the “AUTO”
mode during fan operating, the air conditioning turns on and
the EXHAUST GAS AUTOMATIC mode will operate.
For normal use, it is best to keep the air intake control button
set to OUTSIDE AIR mode. If recirculated air is used during
heating, the windows will fog up more easily.

AIR CONDITIONING
262To change the sensitivity of the sensor switching between
the RECIRCULATED AIR and OUTSIDE AIR in the
AUTOMATIC mode, push the air intake control button and
hold it for a few seconds. The display changes to the one
illustrated below.
The sensitivity of the sensor can be adjusted only while the
vehicle has been stopped.
G21023
The sensitivity of the switches is set to be higher toward “HI”
and lower toward “LO”.
Touch the desired switch on the screen.
When
you push any button except the air intake control button,
the above screen goes off. If manual onoff of the air conditioning is desired—
Touch
the ”A/C” switch to turn the air conditioning on and touch
it again to turn the air conditioning off. If you turn off the air
conditioning manually, the EXHAUST GAS AUTOMATIC
mode will be cancelled.
If the outside temperature is lowered down to around 0 C
(32 F), the air conditioning will turn off automatically. At this
time, the indicator on the A/C switch is off and the EXHAUST
GAS AUTOMATIC indicator light remains on. However, the
EXHAUST GAS AUTOMA TIC mode does not operate. When
the air conditioning turns on as with the raised temperature, the
EXHAUST GAS AUTOMATIC mode resumes.
If the system is used for ventilation, heating in dry weather or
removing frost or exterior fog on the windshield, turn the air
conditioning off once it is no longer required. This will improve
fuel economy. The air conditioning can be used for year −round
automatic temperature control including cooling and
dehumidifying operation.
If the air conditioning compressor does not operate, the
indicator of the ”A/C” switch will blink. If the indicator of the
”A/C” switch blinks even when the ”A/C” switch is touched
again, have the compressor checked by your nearest Lexus
dealer.

AIR CONDITIONING
263
(b) Windshield defogging and defrosting
G21010
To remove interior fog on the windshield—
Push the windshield air flow button.
To remove frost or exterior fog on the windshield—
1. Push the “TEMP” (”
”) button to set the “MAX HOT”.
2. Push the windshield air flow button.
3. Touch fan speed control switch on the right side to obtain a
maximum air flow.
4. Leave the “A/C” switch off. When the windshield air flow button is pushed while operating
in automatic mode, the air conditioning is set to operate and the
OUTSIDE AIR mode is set.
If you push the windshield air flow button once again while in
the windshield air flow mode, the mode then returns to the last
mode used.
CAUTION
Do not use the windshield air flow button during cooled
air operation in extremely humid weather. The
difference between the temperature of the outside air
and that of
the windshield could cause the outer surface
of the windshield to fog up blocking your vision.

AIR CONDITIONING
264
(c) Micro dust and pollen filter
This vehicle is equipped with a micro dust and pollen filter
mode. When this mode is activated, air from the vents will
remove pollen on the driver and passengers.
G21073
Push the micro dust and pollen filter button.
The indicator light and “A/C” switch come on and
RECIRCULATED AIR mode is turned on. Air is delivered from
the instrument panel vents to the areas near the driver and
passengers to remove pollen on them.
When the interior is purified sufficiently with fresh air (after
about 3 minutes at normal outside temperature and about 1
minute at low outside temperature), this mode will be turned off
automatically and the indicator light will go out.
When the micro dust and pollen filter is activated, this mode will
be turned off by pushing the micro dust and pollen filter button
again. The indicator light will also go out.
INFORMATION
 Use this mode to remove pollen quickly carried by the
driver or passengers or through the window in the
days with much pollen.
 Use and push the windshield air flow button to
remove the fog on the windshield in rainy days.
 Fresh air is delivered even when the micro dust and
pollen filter button is turned off.

AIR CONDITIONING
265
(d) Operating tips
To help cool down the interior after parking in the hot sun,
drive for the first few minutes with the windows open. After
the excess heat has blown away, close the windows.
 Make sure the air inlet grilles in front of the windshield are
not blocked by leaves or other obstructions.
 If air flow control is not satisfactory, check the dashboard
vents and rear vents. (See (e) “Center vents, side vents and
rear vents”.)
 Only humid days, do not blow cold air on the windshield.
The windshield could fog up because of the difference in air
temperature on the inside and outside of the windshield.
 Keep the area under the front seats clear to allow air to
circulate throughout the vehicle.
 On cold days, set the fan speed to high for a minute to help
clear the intake ducts of snow or moisture. This can reduce
the amount of fogging on the windows.
 When driving on dusty roads, close all windows. If dust
thrown up by the vehicle is still drawn into the vehicle after
closing the windows, it is recommended that the air intake
control button be set to the OUTSIDE AIR mode to take in
the fresh air and the fan speed selector to any setting except
OFF. 
If following another vehicle on a dusty road, or driving in
windy and dusty conditions, it is recommended that the air
intake control button be temporarily pressed in to the
RECIRCULATED AIR mode, which will close off the outside
passage and prevent outside air and dust from entering the
vehicle interior.
Heating
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards high temperature
Air intake—OUTSIDE AIR
Air flow—FLOOR
Air conditioning—OFF
 For quick heating, select RECIRCULATED AIR mode for a
few minutes. To keep the windows from fogging, select
OUTSIDE AIR mode after the vehicle interior has been
warmed.
 Touch the “A/C” switch on for dehumidified heating.
 Choose floor/windshield air flow to heat the vehicle interior
while defrosting or defogging the windshield.

AIR CONDITIONING
266Air conditioning
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air flow—PANEL
Air conditioning—ON
 For quick cooling, select RECIRCULATED AIR mode for a
few minutes. Ventilation
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air flow—PANEL
Air conditioning—OFF

AIR CONDITIONING
267
Defogging and defrosting
—The inside of the windshield
For best results, set controls to:
For automatic operation—
Temperature— Towards high temperature to heat; low temperature to cool
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
For manual operation—
Fan speed—To the desired fan speed
Temperature— Towards high temperature to heat; low temperature to cool
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used.
This button allows the air intake to select OUTSIDE AIR mode
automatically. This is to clean up the front view more quickly.
If you want to return the setting to RECIRCULATED AIR mode,
push the air intake control button once again. Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.

Only humid days, do not blow cold air on the
windshield—the dif ference between the outside and inside
temperatures could make the fogging worse.
—The outside of the windshield
For best results, set controls to:
For automatic operation—
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
For manual operation—Fan speed—To the desired fan speed
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used.